Security Myths and Passwords
In the practice of security we have accumulated a number of "rules of thumb" that many people accept without careful consideration. Some of these get included in policies, and thus may get propagated to environments they were not meant to address. It is also the case that as technology changes, the underlying (and unstated) assumptions underlying these bits of conventional wisdom also change. The result is a stale policy that may no longer be effective or possibly even dangerous.
Policies requiring regular password changes (e.g., monthly) are an example of exactly this form of infosec folk wisdom. CERIAS Weblogs » Security Myths and Passwords
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